Material Insights · Understanding the Material World

Lead-acid batteries: Impact and additionality

The health cost of informal recycling and the case for replacement

What this tab covers The impact and additionality lens: what it displaces on the grid, who gains and who bears the burden along the supply chain, and what happens at end of life.

Lead-acid does little to decarbonise grids and carries real health risks where recycling is informal; the impact case is mostly in replacing it with lithium or sodium batteries and formalising recycling.

Grid decarbonisation versus fossil displacement

Unfavourable

Lead-acid mostly provides backup, often alongside diesel generators, rather than shifting renewable output, so it displaces little fossil generation. Its short cycle life and low efficiency make it a poor partner for daily solar shifting. Sodium-ion cells could roughly triple the energy density of lead-acid in vehicle retrofits and are being developed as 12 V starter replacements.15

Energy density gain from sodium-ion in retrofits roughly three times1

Just transition and local community impact

Unfavourable

Lead-acid manufacturing and recycling employ many people across India and other emerging markets, often in small firms. Where batteries are broken and smelted without controls, lead contaminates soil, air and the blood of workers and nearby children. UNICEF puts the lost lifetime economic potential from childhood lead exposure in low- and middle-income countries at almost USD 1 trillion, and notes that vehicle numbers there have roughly tripled since 2000, raising battery volumes. Down To Earth reports the UNICEF study as estimating, from an Indian meta-analysis, an average loss of about 4 IQ points per child. Formal recyclers with emission controls and worker protection are the main lever for impact capital; a shift to lithium or sodium batteries will also displace jobs in this sector.910

Lost economic potential from childhood lead exposure (LMICs) almost USD 1 trillion9 Average IQ loss per child, Indian meta-analysis about 4 points10 Growth in vehicle numbers in LMICs since 2000 about threefold9

Circular economy and end of life

Favourable

Lead-acid has the most mature closed-loop recycling of any battery, because lead is easy to recover and valuable, and much of the lead in new batteries is already recovered material. The EU makes this mandatory with 85% recycled lead content from 2031 and 95% lead recovery by end-2031. The weakness is not the recycling rate but its quality: UNICEF estimates up to half of lead-acid batteries in low- and middle-income countries go through unsafe informal recycling.4911

EU minimum recycled lead content (2031) 85%11 EU lead recovery target (end-2031) 95%4

Sources

  1. Sodium-ion batteries: Technology brief (includes lead-acid and lithium-ion comparison data) IRENA, 2025
  2. EU Sustainable Batteries Regulation (2023/1542), policy summary International Energy Agency policy database, 2023
  3. Energy resilience of households in a prepared union: the potential of a sodium battery-based solution European Economic and Social Committee, 2026
  4. A third of the world's children poisoned by lead, new groundbreaking analysis says (The Toxic Truth, UNICEF and Pure Earth) UNICEF, 2020
  5. A third of world's children are poisoned by lead, says UNICEF report Down To Earth (reporting UNICEF and Pure Earth), 2020
  6. Regulation (EU) 2023/1542 concerning batteries and waste batteries (Official Journal text) EUR-Lex, 2023